Compounds A and C in the following reaction are:
\(\mathrm{\small{{CH}_3 {CHO} \xrightarrow[{(ii) ~H_{2}O}]{(i) ~CH_{3}MgBr}({A}) \stackrel{{H}_2 {SO}_4}{\longrightarrow}({B}) \xrightarrow[]{Hydroboration \ oxidation}(C)}}\)
1. Identical
2. Positional isomers
3. Functional isomers
4. Optical isomers
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